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Radeon HD 4850 2GB vs Radeon HD 5830

Intro

The Radeon HD 4850 2GB makes use of a 55 nm design. AMD has clocked the core frequency at 625 MHz. The GDDR4 RAM is set to run at a speed of 993 MHz on this particular model. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.

Compare that to the Radeon HD 5830, which has a clock frequency of 800 MHz and a GDDR5 memory speed of 1000 MHz. It also uses a 256-bit memory bus, and makes use of a 40 nm design. It is made up of 1120(224x5) SPUs, 56 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4850 2GB 110 Watts
Radeon HD 5830 175 Watts
Difference: 65 Watts (59%)

Memory Bandwidth

In theory, the Radeon HD 5830 should be 101% faster than the Radeon HD 4850 2GB in general, because of its higher data rate. (explain)

Radeon HD 5830 128000 MB/sec
Radeon HD 4850 2GB 63552 MB/sec
Difference: 64448 (101%)

Texel Rate

The Radeon HD 5830 is much (approximately 79%) better at texture filtering than the Radeon HD 4850 2GB. (explain)

Radeon HD 5830 44800 Mtexels/sec
Radeon HD 4850 2GB 25000 Mtexels/sec
Difference: 19800 (79%)

Pixel Rate

The Radeon HD 5830 should be a lot (about 28%) more effective at AA than the Radeon HD 4850 2GB, and able to handle higher resolutions better. (explain)

Radeon HD 5830 12800 Mpixels/sec
Radeon HD 4850 2GB 10000 Mpixels/sec
Difference: 2800 (28%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

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Radeon HD 4850 2GB

Amazon.com

Check prices at:

Radeon HD 5830

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon HD 4850 2GB Radeon HD 5830
Manufacturer AMD AMD
Year Jun 25, 2008 February 25, 2010
Code Name RV770 PRO Cypress LE
Memory 2048 MB 1024 MB
Core Speed 625 MHz 800 MHz
Memory Speed 1986 MHz 4000 MHz
Power (Max TDP) 110 watts 175 watts
Bandwidth 63552 MB/sec 128000 MB/sec
Texel Rate 25000 Mtexels/sec 44800 Mtexels/sec
Pixel Rate 10000 Mpixels/sec 12800 Mpixels/sec
Unified Shaders 800(160x5) 1120(224x5)
Texture Mapping Units 40 56
Render Output Units 16 16
Bus Type GDDR4 GDDR5
Bus Width 256-bit 256-bit
Fab Process 55 nm 40 nm
Transistors 956 million 2154 million
Bus PCIe 2.0 x16 PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 3.2

Memory Bandwidth: Bandwidth is the largest amount of information (measured in MB per second) that can be transferred over the external memory interface within a second. It's worked out by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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Radeon HD 4850 2GB

Amazon.com

Check prices at:

Radeon HD 5830

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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